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If the newborn stage was about survival, 4–6 months is about change. Sleep cycles mature, naps consolidate, and you might be in the thick of the infamous 4-month sleep regression. It's a lot. But it's also the stage where real routines start to take shape.
This guide gives you wake windows, sample schedules, and regression survival tips for 4–6 months, fast. All recommendations follow Red Nose Australia, Tresillian, and Karitane guidelines.
The 4-month regression is a permanent neurological change: your baby's sleep cycles mature from newborn (50-minute) to adult-like (90-minute) cycles. They now surface into light sleep between cycles and may struggle to link them. It typically lasts 2–6 weeks.
When to check with your GP: If the regression lasts longer than 6 weeks with no improvement, or if your baby seems in pain (not just fussy). Sometimes what looks like a prolonged regression is actually reflux, a food intolerance, or an ear infection.
In the thick of it? Read the full guide: Complete 4-Month Sleep Regression Guide →
At 4 months, wake windows are 1.5–2.5 hours. Most babies take 4 naps. Watch tired signs, eye rubbing, yawning, grizzling, not the clock.
Wake windows stretch to 2–2.5 hours and most babies drop to 3 naps. Night sleep should be consolidating, many 5-month-olds can manage a 6–8 hour stretch without a feed. Rolling is the big milestone at this age. Your baby may roll onto their tummy in the cot overnight and wake themselves up. Give plenty of daytime floor practice. Stop swaddling immediately once your baby can roll and switch to an arms-out sleeping bag. A brief sleep disruption (1–2 weeks) is common around this age from rolling and increased awareness, stay consistent and it will pass.
Wake windows reach 2–3 hours. Most 6-month-olds take 3 solid naps and need 12–15 hours total sleep. Around this age, object permanence emerges, your baby now knows you exist when you leave the room, which can spike separation anxiety at bedtime. Daytime peekaboo games and a consistent routine help. This disruption typically lasts 2–4 weeks.
| Time of Day | Wake Window | Notes |
|---|---|---|
| Morning (after waking) | 2–2.5 hours | Shortest window |
| Mid-morning (after Nap 1) | 2.5–2.75 hours | Active play helps tire them out |
| Afternoon (after Nap 2) | 2.5–3 hours | Wind down toward the end |
| Before bed (after Nap 3) | 2.5–3 hours | Longest window; consistent routine helps |
Most babies drop from 4 naps to 3 between 4–5 months. Signs: the fourth nap becomes a battle, bedtime pushes past 8:30 PM, or your baby can comfortably manage a 2-hour wake window before bed.
How to do it: Stretch wake windows by 10–15 minutes across the day, drop the fourth nap, and bring bedtime forward to 6:00–6:30 PM during the transition. Expect it to take 1–2 weeks, some days they'll need four naps, others three. That's normal.
Early bedtime is your best tool. A 6:00 PM bedtime during a nap transition is strategy, not failure. An overtired baby fights sleep harder and wakes more. Tresillian recommends earlier bedtimes during nap transitions as standard practice.
Around 6 months, starting solids can affect sleep, some babies settle better with a fuller tummy, others have temporary digestive disruption. Introduce new foods at lunchtime (not dinner) so you spot reactions during the day. Leave at least 45 minutes between solids and naps. Don't expect solids to magically fix sleep, developmental changes and sleep associations matter more than hunger at this age.
Red Nose Australia guidelines: always place baby on their back, firm flat mattress, no loose bedding or cot bumpers, room share for at least 6–12 months. Stop swaddling at the first sign of rolling, transition to an arms-out sleeping bag. If your baby rolls onto their tummy independently during sleep, you don't need to roll them back as long as the cot is clear of hazards. Full safe sleep checklist →
A safe, well-fitted baby sleeping bag keeps your baby warm without the risks of loose bedding, and arms stay free for rolling. See our top picks.
See Our Best Baby Sleeping Bags →A permanent neurological shift where your baby's sleep cycles mature to adult-like 90-minute cycles. They wake more fully between cycles and may struggle to link them. It lasts 2–6 weeks, stay consistent and don't introduce new sleep associations. Full regression guide →
1.5–2.5 hours. The first window is shortest (1.5–1.75 hrs), the last before bed is longest (2–2.5 hrs). Most 4-month-olds take 4 naps and need 12–15 hours total sleep. Follow tired signs over the clock.
Between 4–5 months. Signs: the fourth nap becomes a battle, bedtime pushes past 8:30 PM, or baby manages a 2-hour wake window before bed. Stretch wake windows by 10–15 minutes, drop the fourth nap, and bring bedtime forward to 6:00–6:30 PM for 1–2 weeks.
Back to sleep, firm flat mattress, no loose bedding or bumpers, room share for at least 6–12 months. Stop swaddling at first sign of rolling, switch to an arms-out sleeping bag. Full safe sleep guide →
